Well made and easy to install - R&D Precision 9mm Colt Pattern Mag Well Insert

This adapter didn’t take long to install and was pretty easy. I used removable thread locker on the two set screws that goes in an angle pressing on the front interior of the magazine well of the lower receiver. There’s another screw that holds down the adapter in the magazine well. The adapter is very secure in the mag well and doesn’t move around at all. The only adjustment I needed to do was bend the ejector in a little bit because the magazine wouldn’t click into place because the ejector was in the way. I just needed to bend it slightly in for the magazine to clear the ejector and have it in the right position to eject the cartridges. I haven’t shot the gun so I don’t know how it actually works while shooting it. I took a mix of round nose and flat point cartridges and ran it through the gun. It mostly fed well except some cartridges, while holding the gun sideways, would make some of the cartridges fall into a void behind the magazine inside the upper receiver. I don’t know if it would do this if I actually shot cartridge through the gun but it happened just working the bold carrier back manually. It fed most of the round-nose and flat-point cartridges into the chamber and ejected them smoothly. I won’t know until I actually shoot the gun. The price was good and it’s well made out of aluminum and steel. It’s very sturdy and doesn’t move inside the magazine well once the set screws are tightened. The adapter is a pretty snug fit in the magazine well. The original magazine release is used to lock into place and remove the magazines. On my Rock River magazine I had to push the magazine with some energy to lock it into place. There’s no movement or wobble in the magazine once it’s locked into place. It’s nice that the magazine adapter can be removed. Nothing is permanently changed on the lower receiver. The adapter can be removed it needed relatively quickly. It’s a nice design and well made.